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Summary of Significant Accounting Policies - Net Operating Revenues & Accounts Receivable (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Concentration Risk [Line Items]
Net operating revenues	$ 5,121.6	$ 4,644.4	$ 4,605.0
Inpatient Rehabilitation
Concentration Risk [Line Items]
Net operating revenues	4,015.0	3,566.2	3,513.0
Home Health and Hospice
Concentration Risk [Line Items]
Net operating revenues	1,106.6	1,078.2	1,092.0
Payor Source | Revenue from Contract with Customer Benchmark
Concentration Risk [Line Items]
Net operating revenues	5,121.6	4,644.4	4,605.0
Payor Source | Revenue from Contract with Customer Benchmark | Inpatient Rehabilitation
Concentration Risk [Line Items]
Net operating revenues	4,015.0	3,566.2	3,513.0
Payor Source | Revenue from Contract with Customer Benchmark | Home Health and Hospice
Concentration Risk [Line Items]
Net operating revenues	1,106.6	1,078.2	1,092.0
Payor Source | Revenue from Contract with Customer Benchmark | Medicare | Third-Party Payor
Concentration Risk [Line Items]
Net operating revenues	3,496.2	3,271.5	3,457.3
Payor Source | Revenue from Contract with Customer Benchmark | Medicare | Third-Party Payor | Inpatient Rehabilitation
Concentration Risk [Line Items]
Net operating revenues	2,589.7	2,375.5	2,537.3
Payor Source | Revenue from Contract with Customer Benchmark | Medicare | Third-Party Payor | Home Health and Hospice
Concentration Risk [Line Items]
Net operating revenues	906.5	896.0	920.0
Payor Source | Revenue from Contract with Customer Benchmark | Medicare Advantage | Third-Party Payor
Concentration Risk [Line Items]
Net operating revenues	727.0	661.1	487.4
Payor Source | Revenue from Contract with Customer Benchmark | Medicare Advantage | Third-Party Payor | Inpatient Rehabilitation
Concentration Risk [Line Items]
Net operating revenues	609.6	544.9	375.5
Payor Source | Revenue from Contract with Customer Benchmark | Medicare Advantage | Third-Party Payor | Home Health and Hospice
Concentration Risk [Line Items]
Net operating revenues	117.4	116.2	111.9
Payor Source | Revenue from Contract with Customer Benchmark | Managed Care | Third-Party Payor
Concentration Risk [Line Items]
Net operating revenues	549.9	419.2	381.8
Payor Source | Revenue from Contract with Customer Benchmark | Managed Care | Third-Party Payor | Inpatient Rehabilitation
Concentration Risk [Line Items]
Net operating revenues	484.5	371.4	342.7
Payor Source | Revenue from Contract with Customer Benchmark | Managed Care | Third-Party Payor | Home Health and Hospice
Concentration Risk [Line Items]
Net operating revenues	65.4	47.8	39.1
Payor Source | Revenue from Contract with Customer Benchmark | Medicaid | Third-Party Payor
Concentration Risk [Line Items]
Net operating revenues	178.6	155.7	128.7
Payor Source | Revenue from Contract with Customer Benchmark | Medicaid | Third-Party Payor | Inpatient Rehabilitation
Concentration Risk [Line Items]
Net operating revenues	163.1	140.1	110.3
Payor Source | Revenue from Contract with Customer Benchmark | Medicaid | Third-Party Payor | Home Health and Hospice
Concentration Risk [Line Items]
Net operating revenues	15.5	15.6	18.4
Payor Source | Revenue from Contract with Customer Benchmark | Other third-party payors | Third-Party Payor
Concentration Risk [Line Items]
Net operating revenues	46.0	43.0	43.4
Payor Source | Revenue from Contract with Customer Benchmark | Other third-party payors | Third-Party Payor | Inpatient Rehabilitation
Concentration Risk [Line Items]
Net operating revenues	46.0	43.0	43.4
Payor Source | Revenue from Contract with Customer Benchmark | Other third-party payors | Third-Party Payor | Home Health and Hospice
Concentration Risk [Line Items]
Net operating revenues	0.0	0.0	0.0
Payor Source | Revenue from Contract with Customer Benchmark | Workers’ compensation | Third-Party Payor
Concentration Risk [Line Items]
Net operating revenues	23.4	22.5	30.2
Payor Source | Revenue from Contract with Customer Benchmark | Workers’ compensation | Third-Party Payor | Inpatient Rehabilitation
Concentration Risk [Line Items]
Net operating revenues	23.1	21.5	29.2
Payor Source | Revenue from Contract with Customer Benchmark | Workers’ compensation | Third-Party Payor | Home Health and Hospice
Concentration Risk [Line Items]
Net operating revenues	0.3	1.0	1.0
Payor Source | Revenue from Contract with Customer Benchmark | Patients | Self-Pay
Concentration Risk [Line Items]
Net operating revenues	20.1	20.1	23.9
Payor Source | Revenue from Contract with Customer Benchmark | Patients | Self-Pay | Inpatient Rehabilitation
Concentration Risk [Line Items]
Net operating revenues	19.3	19.2	23.3
Payor Source | Revenue from Contract with Customer Benchmark | Patients | Self-Pay | Home Health and Hospice
Concentration Risk [Line Items]
Net operating revenues	0.8	0.9	0.6
Payor Source | Revenue from Contract with Customer Benchmark | Other income
Concentration Risk [Line Items]
Net operating revenues	80.4	51.3	52.3
Payor Source | Revenue from Contract with Customer Benchmark | Other income | Inpatient Rehabilitation
Concentration Risk [Line Items]
Net operating revenues	79.7	50.6	51.3
Payor Source | Revenue from Contract with Customer Benchmark | Other income | Home Health and Hospice
Concentration Risk [Line Items]
Net operating revenues	$ 0.7	$ 0.7	$ 1.0
Payor Source | Accounts Receivable
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	100.00%	100.00%
Payor Source | Accounts Receivable | Medicare | Third-Party Payor
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	63.60%	66.50%
Payor Source | Accounts Receivable | Managed care and other discount plans, including Medicare Advantage | Third-Party Payor
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	27.40%	25.00%
Payor Source | Accounts Receivable | Medicaid | Third-Party Payor
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	3.70%	3.70%
Payor Source | Accounts Receivable | Other third-party payors | Third-Party Payor
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	2.60%	2.70%
Payor Source | Accounts Receivable | Workers’ compensation | Third-Party Payor
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	1.50%	1.20%
Payor Source | Accounts Receivable | Patients | Self-Pay
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	1.20%	0.90%

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